I read the section in the Wiki (again), and it helped to add the IP to the local networks in settings. I did not really see the connection between adding the IP and the error message, but... it works now.

Thanks!

I am trying to control my Zigbee2MQTT lights via a dzVents scripts. I can turn on and off the lights with ".switchOn()" and ".switchOff()", but I can't change the color/color temperature or the brightness. If I call any of the other methods (".setColor()", ".setRGB()" etc.) I get this in the log ...